Resistor



H. H. JOHNSTON.

RESISTOR.

APPLICATION FILED MAY I4. I920.

1,406,393, PzItented Feb.14, 1922.

INVENTOR WITNESSES:

' fiawardfic/o/msfon. 44, C2. QJM BY I UNITED STATES PATENT OFFICE.

OWAR H. Jon' s'roN, 0F EDGEWOOD PARK, PENNSYLVANIA, ASSIGNOR T0 WEST- INGHOUSE ELECTRIC 8c SYLVANIA; i

' Application fil ed'May 14,

To all whom it may concern:

Be it known that L'HOWARD H. JOHNSTON, a citizen of the United States, and a resident of Edgewood Park, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Resistors of which the following is a specification. I

My invention relates to electrical resistance devices, and it has particular relation to resistors which must be relatively compact, such, for example, as those employed in motor driven vehicles.

The objectof my invention is to provide a resistance device, which is of relatively simple design, economical in manufacture, durable in construction, inexpensive to operate and relatively compact. I

Heretofore, it has been customary to construct resistance devices having relatively great resistance and compactness by mounting a plurality of resistance grids in sideby-side relation upon parallel insulated rods. Tubular resistors have only been employed where economy of space is not required.

In accordance with my invention, 1' provide a compact tubular resistance device, which has relatively great resistance and which may readily be assembled and connected to an electrical circuit.

Briefly speaking, my invention consists in concentrically mounting a plurality of tubular resistors of different diameters upon an insulated base by means of clamps, which may be connected to an electrical circuit.

For a better understanding of my invention reference may now be had to the accompanying drawings, Fig. 1 of which is a view, in side elevation, of a resistance device comprising a plurality of tubular resistors concentrically mounted upon an insulated base by means of resilient clamping members. Fig. 2 is a view, in end elevation, of the device of Fig. 1. Fig. 3 is a view, in side elevation, of a portion of a number of tubular resistors concentrically mounted and secured to end plates. Fig. 4; is a cross-sectional view of the resistors shown in Fig. 3, taken along the line IVIV.

Referring particularly to Figs. 1 and 2, annular resistors 1, 2 and 3 are concentrically mounted upon a base 4.- by means of pairs of resilient clamping members 5, 6'and 7 respectively. These resistors may be constructed of r sistan Wire h lically wound upon MANUFAGTURINGCOMPANY, A CORPORATION or PENN- RESISTOR.

j Specification-of Lettersl'a'tent. Patented Feb. 14:, 1922.

1920. Serial Ne. 381,503.

tubesof insulating material or upon metal tubin'gand insulated therefrom by layers of mica and asbestos paper. The clamping members 5 and G are separated from the base at by means of spacing blocks 8 and 9, respectively, which are of such dimensions, that the resistors 1, 2 and 3 are uniformly spaced with respect to each other to provide for'th'e circulation of air there-between. The clamping members 5,. 6 and? are provided with binding posts 10, certain of which are connected by conductors. 11. The resistors 1, 2"and 3 may be connected in series or parallel relation by suitably arranging their electrical connections in any well-known manner.

Figs. 3 and 4 show a different method of mounting a plurality of concentrically disposed resistors. Resistors 12, 13 and 1 1 are connected by means of end plates 15, made of some suitable insulating material, such, for example, as micarta, metal straps 16 and tie rods 17. Annular metal collars 18 of suitable size are provided at the ends of the resistors 12, 13 and 141 to secure good electrical contact between the ends of the resistors and binding posts 19. If it is desired, similar collars may be attached to the ends of resistors 1, 2 and 3 of Fig. 1.

It will be observed by those skilled in the art that by my invention, I provide a compact and efficient resistance device which will consume relatively great values of electrical energy for brief intervals of time without injury thereof.

lVhile I have shown my invention in a preferred form, it is subject to modification by minor changes without departingfrom the spirit thereof, therefore, I desire to be limited only by the scope of the appended claims.

I claim as my invention 1. In a resistance device, the combination with a self-sustaining resistor, of a larger self-sustaining resistor substantially enclosing said resistor and spaced therefrom.

2. In a resistance device, the combination with a resistor, of a hollow resistor of greater diameter detachably surrounding said resistor.

3. In a resistance device, the combination with a plurality of self-sustaining resistors, of means for mounting said resistors c0ncentrically.

4. In a resistance device, the combination ors within one another.

5. In a resistance device, the combination with a plurality of independentannular resistors, of means for concentrically mount-f .with a plurality of tubular resistors coning said resistors.

. 6. In a resistance device, the combination with a plurality of self-sustaining tubular resistors of difierent lengths, of means for mounting said resistors one within the other.

7. A1 resistance device, the combination with a plurality of self-sustaining cylindrical resistors of different lengths, of

means for concentrically mounting said resistors. v v V 8. In a resistance device, the combination with a resistor, of resilient means for detachably mounting said resistor and connecting it to an electric circuit. V

9. In a resistance devlce, the combination with a tubular resistor, of a curved resilient member for detachably mounting said resister and connecting it to an electric circuit.

1Q. In a resistance device, the combination with a plurality of tubular resistors concentrically disposed and provided with metal collars at their ends, of'means for detachably mounting said resistors. '11. In a resistance device, the combination tachably I mounting said resistors concentrically. v

13. In a resistancedevice, the combination with a resistor, of v a tubular resistor of shorter length and greater diameter surrounding said resistor and resilient clamp- 7 ing members for p'ositioning said resistor.

In testimony whereof, I have hereunto subscribed myname this 28th day of April, 1920. I HOWARD OHNSTON- 

